It”s easy to tell the difference between the monster that lurks beneath Loch Ness in Scotland and the one that was briefly sighted Sunday in Vallejo”s Lake Chabot.

The Vallejo creature wore mascara.

For about an hour Sunday, the lake bounded by Dan Foley Park and Six Flags Discover Kingdom hosted the latest project of Vallejo art car factory Obtanium Works: a foam replica of the so-called Loch Ness Monster.

“This might not be a real monster,” said Shannon Lacy, who watched from the fishing dock as the green monstrosity bobbed on the lake surface.

The artists of Obtanium Works, known for creating their fantastical art cars that have become a staple at both Burning Man and Vallejo events like the Mad Hatter Parade, spent months developing the early April Fools prank.

They even put together a two-page faux history of “The Lake Chabot” creature, which can be traced back to the Spanish Mission era and to the modern day investigation of the “Traveling Academy of Unnatural Sciences — Cryptozoology Division.”

Like the Scottish monster affectionately known to locals there as “Nessie,” the Lake Chabot monster also has a name.

“We call her Cecil the Sea Monster,” Kathy O”Hare said, as guests at Discovery Kingdom whipped out their phones to photograph the spectacle.

From far away, Cecil looked eerily similar to the classic images purported to be Nessie.

But closer inspection revealed a creature with pretty eyes, re-used gold and green shamrocks from St. Patrick”s Day and a sandbag weighing it down.